I'm just curious. I want to know how they can fit story elements together such that a) it makes sense to have a metal song in a kids film, b) it has the song's inclusion be funny or make sense in the context of the film without the majority of the audience knowing about metal, c) it does justice to metal, and Mastodon, and isn't just for a cheap laugh ("It's funny because a character listens to music that doesn't sound like pop music. Ha.").
Basically: I just don't want to see the movie end with a music video of Smashmouth singing "I'm a Believer."